multiplet

noun
mul·ti·plet | \ˈməl-tə-plət \

Definition of multiplet 

1 : a spectrum line having several components

2 : a group of elementary particles that are different in charge but similar in other properties (such as mass)

First Known Use of multiplet

1920, in the meaning defined at sense 1

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The first known use of multiplet was in 1920

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